Home Page for the TeradataForum

Archives of the TeradataForum

Message Posted: Thu, 10 Nov 2005 @ 19:36:58 GMT

  <Prev Next>   <<First <Prev Next> Last>>  

Subj:   Re: Statistics and data distribution
From:   David Wellman

The statistics tell the optimiser about max/min data values, the number of rows, number of nulls. This is more important when a column has very skewed data values (i.e. a large percentage of rows contain the same data value for a specific column).

Statistics don't actually tell the optimiser anything about the distribution of the rows across the AMPs.



Ward Analytics Ltd: Information in motion (www.ward-analytics.com)

  <Prev Next>   <<First <Prev Next> Last>>  
  Top Home Privacy Feedback  
Copyright for the TeradataForum (TDATA-L), Manta BlueSky    
Copyright 2016 - All Rights Reserved    
Last Modified: 28 Jun 2020